The first actual robot ____ invented in 1961.
Đáp án đúng là: A. was
Giải thích:
Sử dụng thì quá khứ đơn bị động 'was invented' để diễn tả một hành động đã xảy ra trong quá khứ. 'In 1961' là dấu hiệu của thì quá khứ đơn.
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